I've been looking at some 8020 series tractors that were said to have had integrated autotrac ready kits field installed. I crawled all under the front end looking for a wheel angle sensor like my 4720 sprayer has but couldn't find anything. Did they use some other type of setup? It does have the reciever bracket and a resume switch in it. I just don't want to purchase and find out it was set up for an ATU. Also, I didn't know were to look for the steering valve itself. Thanks